tuple.index（） [英] tuple.index()
问题描述
为什么元组类型没有索引方法？这似乎是一个奇怪的限制，必须有一些原因。是的，
我知道这是一个相当罕见的要求。
问候，
Nick Maclaren。
Why doesn''t the tuple type have an index method? It seems such a
bizarre restriction that there must be some reason for it. Yes,
I know it''s a fairly rare requirement.
Regards,
Nick Maclaren.
推荐答案
Nick Maclaren写道：
Nick Maclaren wrote:
为什么元组类型没有索引方法？这似乎是一个奇怪的限制，必须有一些原因。
Why doesn''t the tuple type have an index method? It seems such a
bizarre restriction that there must be some reason for it.
哈！无法删除或添加到元组的东西是一个偶然的限制！
< / F>
hah! not being able to remove or add things to tuples is an even
bizarrer restriction!
</F>
文章< ma *************************** ************@蟒蛇。 org>，
Fredrik Lundh< fr ***** @ pythonware.comwrites：
|>
|为什么元组类型没有索引方法？好像是这样的
|奇怪的限制，必须有一些理由。
|>
|哈！无法删除或添加元组的东西是一个偶然的
|奇怪的限制！
Eh？为什么？
我对元组和列表之间差异的理解是
实际上前者是不可变的而后者是可变的。
但是一个索引方法在一个不可变的
序列中就像在一个可变的序列上一样有意义。
问候，
Nick Maclaren。
In article <ma***************************************@python. org>,
Fredrik Lundh <fr*****@pythonware.comwrites:
|>
| Why doesn''t the tuple type have an index method? It seems such a
| bizarre restriction that there must be some reason for it.
|>
|hah! not being able to remove or add things to tuples is an even
|bizarrer restriction!
Eh? Why?
My understanding of the difference between a tuple and a list is
PRECISELY that the former is immutable and the latter mutable.
But an index method makes precisely as much sense on an immutable
sequence as it does on a mutable one.
Regards,
Nick Maclaren.
Nick Maclaren写道：
Nick Maclaren wrote:
为什么元组类型没有索引方法？这似乎是一个奇怪的限制，必须有一些原因。
Why doesn''t the tuple type have an index method? It seems such a
bizarre restriction that there must be some reason for it.
实际上，元组根本没有非-__ underscored__方法。列表
count（）方法对于元组也很有用，因为它没有修改
任何东西。我不知道为什么他们也没有实施。
格伦
In fact, tuples have no non-__underscored__ methods at all. The list
count() method would also be useful for tuples, since it doesn''t modify
anything. I have no idea why they aren''t implemented either.
Glenn
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